Created partial German translation (30%); closes #230

Individual commits squashed:
  Create de-de.po
  Update de-de.po
  spelling
  missed plural form

Hooked up de_DE.po correctly while at it.  Thanks!  :)

lang/Makefile

@@ -5,7 +5,7 @@ MSGFMT=		msgfmt --strict
 
 LOCALEDIR=	/usr/local/share/locale/%%LANG%%/LC_MESSAGES
 
-LANGUAGES=	es_CO ja_JP zh_CN
+LANGUAGES=	de_DE es_CO ja_JP zh_CN
 TEMPLATE=	en_US
 
 .for LANG in ${LANGUAGES}